Table slide



Jan. 14, 1941. w. A DUNCAN .TABLE SLIDE Filed oct. 1S, 1939 `INVENTOR.

5 Sheets-Sheet l ATTORNYS.

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W. A. DUNCAN f TABLE SLIDE Jan. 14, 1941.-

Fi1d 061'.. 18, 1959 3 Sheets-Sheet 2 Jan. 14,1941. w. A. DUNCAN TABLE SLIDE 3 Sheets-Sheet 3 Filed Oct. 18, 1939 Patented Jan. 14, 1941 UNITED STATES PATENT-OFFICE 'TABLE SLIDE v William A. Duncan, statesviue, N. o.. 1 Application October 18, 1939, Serial No. 300,051

1 Claim.

The device forming the subject matter of this pplication is a slide mechanism for an extension table. The invention aims to provide novel means for mounting the rack and pinion with respect to the rails and the equalizing bar, to provide a device which will operate noiselessly, and to supply a structure in which working parts will be housed from view.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present application appertains.

With the above and other objects in view, which will appearv as the description proceeds,

' the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings:

Fig. 1 shows in longitudinal section, a device constructed in accordance with the invention, mounted on a table;

Fig. 2 is a horizontal section, the device being collapsed;

Fig. 3 is a longitudinal vice extended;

Figs. 4 and 5 are cross sections taken, respectively, on the lines 4 4 `and 5 5 of Fig. 2; f

Fig. 6 is a transverse section taken taken on the line 6 6 of Fig. 3;

Fig. 7 is an elevation showing a modification;

Fig. 8 is a longitudinal section of the structure shown in Fig. 7;

Fig. 9 is a cross section on the line 9 9 of Fig. 8:

Fig. 10 is a longitudinal section showing a modification;

Fig. 11 is a cross picted in Fig. 10.'

Referring to the form shown in Figs. 1 to 6J the numeral I marks parts of an extension table top, and to the respective parts I are secured outer rails 2, provided upon their inner sides with longitudinal dovetailed grooves 3.

The numeral 4 designates an-equalizing slide, disposed between the outer rails 2 and slidable with respect thereto, the rails 2 and the equalizing slide 4 preferably being of solid wooden oonstruction. On its opposite sides, the equalizing slide 4 has longitudinal dovetailed -grooves 5, facing the grooves 3 of the rails 2, as Figs. 4 and section showing the de- 'are formed elongated seats section of the structure de-` 5 will make manifest. The grooves 5 define, in the equalizing slide 4, a reduced rib 6, disposed between the grooves.

In the rails 2, at the bases of the grooves 3,

1, wherein are re- 5 ceived the rectangularly disposed base flanges 8 of angle members including rack flanges 9 extended into the grooves 3 of the rails 2. In the grooves 3 of the rails 2 are secured first blocks I Il, which are shaped to be received slidably in l0 the grooves 5 of the equalizing slide 4, thereby to aid in connecting the member 4 slidably with the rails 2. The blocks I0 are disposed diagonally with respect to each other, as can be seen in Fig. 2. l 15 Second blocks II are secured in the grooves 5 of the equalizing slide 4, in diagonal relation to each other, the blocks II being slidably received in the grooves 3 of the rails 2, to .aid in connecting the equalizing slide 4, slidably, to the 20 rails 2. The blocks II have longitudinal recesses I2, disposed at the bases of the grooves 3 in the rails 2 and adapted to receive the ends of the racks 9, when the table is extended, as shown in Fig. 3.

A slot I4 is formed in the rib Ii of the equalizving slide 4, and in the slot I4 is received a pinion I5, extended into the grooves 5 of the equalizing slide, the pinion being mounted to rotate on a shaft or pin I6, mounted in the equalizing slide, 30 but extended only Ipart-way therethrough, so that the pin cannot drop out.

Noting Fig. 3 of the drawings, the table may be extended until the racks 9 come into contact with the blocks II. When the table is extended, 35 as shown in Fig. 3, the racks 9 are received in the recesses I2 of the stop blocks II. The construction is such, as shown in Fig. 3, that the racks 9 and the pinion I5 always are concealed.

In Figs. 7, 8 and 9, parts hereinbefore described 4.0 are designated by numerals already used, with the suix afi In this form of the invention, thev racks 9a are located in longitudinal grooves I1 in the rails 2a, the slot I4a being located accordingly, as shown in Fig. 9. 'I'he grooves I1 45 are somewhat longer than the racks 9a, so that the pinion I 5a may be engaged with the racks 9a, and the blocks Illa and Ila be permitted to be received in the grooves with which they coact, in the assembling of the device. In this 50 form of the invention, the elongating of the device is limited by a movable wooden rod I8 or the like, interposed between the blocks I Ila and I I a In Figs. 10 and 11, parts hereinbefore described 55 have been designated by numerals already used, with the suilix 1). The characteristic feature of this form of the invention is that the racks 9b and the pinion 15b are made of hard ber or some similar material, an absolutely noiseless structure resulting. When fiber or its equivalent is used, it is desirable to have the racks 9b and the pinion I5b somewhat Wider than are the corresponding parts in Figs. 'l to 9.

a slot, the rails and the slide having dovetailed grooves there being seats in the rails, at the bases of the grooves thereof, first blocks iixed in the grooves of the rails and slidable in the grooves of the slide, second blocks fixed in the grooves of the slide and slidable in the grooves of the rails, all blocks conforming in transverse section to the grooves, to hold the rails and the slide against lateral separation, angle members comprising rack flanges extended into the grooves of the slide, and base anges secured in the seats of the rails, and a pinion located in the slot and meshing with the rack flanges, the pinion being supported for rotation on the slide, the second blocks having longitudinal recesses, disposed at the bases of the grooves of the rails and receiving the ends of the rack flanges when the' table structure is extended.

WILLIAM A. DUNCAN. 

